Is this glass half empty?

I'm not going to argue the volume of the contents - they're 50%. Half of whatever was contained inside it was consumed in a presumably rule compliant manner. But we all know that until someone tops it up, it will not feel complete.

I'm not going to argue the volume of the contents - they're 50%. Half of whatever was contained inside it was consumed in a presumably rule compliant manner. But we all know that until someone tops it up, it will not feel complete.

I'm not going to argue the volume of the contents - they're 50%. Half of whatever was contained inside it was consumed in a presumably rule compliant manner. But we all know that until someone tops it up, it will not feel complete.

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The more important question is, Is that water or vodka ? Worse, it might be a stale 7 Up.
Warm or cold ?

Due to evaporation, there is always some water vapor in the upper half and some kind of equilibrium between the vapor and the liquid due to dynamic exchange of molecules between the 2 phases. If a lid was put, true dynamic equilibrium will settle in, and there will be a vapor pressure above the liquid phase. In that case, half empty is also like full.

Due to evaporation, there is always some water vapor in the upper half and some kind of equilibrium between the vapor and the liquid due to dynamic exchange of molecules between the 2 phases. If a lid was put, true dynamic equilibrium will settle in, and there will be a vapor pressure above the liquid phase. In that case, half empty is also like full.